By Meghan Overdeep
Updated Jul 21, 2016 @ 9:30 am
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attend a Dinner & Auction during The Leonardo DiCaprio Foundation 3rd Annual Saint-Tropez Gala at Domaine Bertaud Belieu on July 20, 2016 in Saint-Tropez, France.
Credit: Victor Boyko/Getty

Hollywood was out in full force Wednesday night for Leonardo DiCaprio's third-annual fundraising auction for the Leonardo DiCaprio Foundation in sunny St. Tropez, France.

A-listers like Mariah Carey, Naomi Campbell, Bradley Cooper, Kate Hudson, Tobey Maguire, Jonah Hill, Edward Norton, Bono, Joan Smalls, Petra Nemcova, and The Weeknd, were all on hand to raise money for environmental awareness efforts and research on climate change, conservation, and preservation grants across the world. DiCaprio's foundation has donated more than $59 million to 112 projects across 48 countries since 2008 and ultimately raised more than $45 million at Wednesday's event.

After welcoming his guests and urging him to help his cause, the Oscar-winner joined his famous friends for the party.

attend a Dinner & Auction during The Leonardo DiCaprio Foundation 3rd Annual Saint-Tropez Gala at Domaine Bertaud Belieu on July 20, 2016 in Saint-Tropez, France.
Credit: Victor Boyko/Getty
attend a Dinner & Auction during The Leonardo DiCaprio Foundation 3rd Annual Saint-Tropez Gala at Domaine Bertaud Belieu on July 20, 2016 in Saint-Tropez, France.
Credit: Kristy Sparow/Getty

Carey, who arrived to the event via boat, stole the spotlight in a sexy floor-length black gown featuring a plunging neckline and a high slit that showed off the "Fantasy" singer's fishnet-clad legs.

"Great job Leo," the pop diva wrote alongside a photo of her and the host on Instagram.

Meanwhile, Czech beauty Nemcova stunned on the opposite end of the color wheel in a form-fitting, white Grecian-inspried gown by Georges Chakra.

"Let's come together for our Mother Earth every day not just at #leonardodicapriofoundation gala!" the former model captioned a snap of her, Hudson, Norton, and Italian singer Andrea Bocelli.

Victoria's Secret model Joan Smalls and her gaggle of gorgeous gals were also in attendance, stopping to pose for group photos in their gowns before the sun went down.

Looks like it was a beautiful night to support a worthwhile cause.